Ruptural safety means



Dec. 13, 1927.

O. GEORG RUPTURAL SAFETY MEANS Filed July 27. 1926 2 Sheets-Sheet 1 l Hm XF m O. GEORG RUPTURAL SAFETY MEANS Dec. 13, 1927.

Filed July 27. 1926 2 Sheets-Sheet 2 Patented Dec. 13, 1927.

UNITED. ysra-TES Leszssz PATENT 1' oFFiicE-.I

o'r'ro GEoRG, or DUSSELDORF, GERMANY.

RUPTURAL serrati; M Ealis.

Applicaties filed JulyV 27,1926, serial No. 125,216, and in Germany July25, 19.25.V

.This invention-'has reference to improvements inl means for increasingthe safety of connected partsr=of-machinery against'v the effects ofbreaking, bending and detlecting strains, iandl it is'fone of' theimportant obi jectsofgthis -invehtion to produce a consideri ableincrease inthe factor of safety without interfering '-lwithf the'working' I operation fof the partsfor various purposes and with'themanufactureand usefulness-of the apparatus and machinery produced fromsuchinaterial. In thec'ase of heavy machinetools, such :as eccentricpresses, forgingI machinery, coldstroke-presses, roller works andtheflike, an: absolutely unobj ectionable'fmeans of protecting 'the'heavy and expensive' machinebod'y' -from the `etl'ect'-sftd5'breakingand; distortionistrains isiindispensably necessary, in:-v asmuchms 'ther'kindi of ythe' work to -be performed frequently* results finoverstepping the-.maximum of'r'the admissible pressure.

My invention provides a means whereby the connected artsA cfa-machinearef protected against injury under axially operating'working pressureby the use of a helical surface adapted to convert axial pressure into atorque extending around the axis of pressure. The torque is then securedagainst excessive strains by the ordinary instru- CJI .0 mentalities,such as detrusive or shearing studs, or any other suitable frangible,separable or releasing means.

The invention will be more particularly described with reference to theaccompanying drawing, showing by way-of exemplification certainembodiments of the principles of my invention, as applied to diferentkinds of machinery. Figure 1 illustrates a forging machine with apressure-safety device according to this invention in verticallongitudinal section. Figure 2 illustrates the pressure rod of themachine on an enlarged scale and showing a modified construction.Figures 3 and 4 are side and end views of a safety device showinganother modified construction.

In the form of construction according to Figure 1 the pressure rod of acrank-operated press (orging machine, fin removing .o press or the like)is built to operate as a safety pressure rod. The pivoting head 1 of thejoint rests with its rear surface upon the 'spindle or shaft-surroundingsleeve 2 the steep screw threads of which engage with the pressure rod4. For the backward movement the pivoting head 1 is connected by thespindle 5 :mathe Samvnuta-e u the said v spindle ,sleeve 2,V but ltheshafftor.'spindle '5 may 'still be freely rotated'fin-'thefspindlesleeve A2. y The 'spindle sleeve' Qfand the pres sure rod l4 aresecured-against rotation Vwith relation to each other by means :o'fftwoshear- "2 ing bolts -7 and Sv'vhich are'fdisposc'e'd inthe bipartitelsheari'nf'gfb'oxe'a's' 9""a`n'd"10 respectively. f The bolts -f are.`edj dimensione'cl' and adjusted vthat theyl wi'llebe'f's'heared off'=l1pon the f ov'erstepping' of aai-certain" pressure. l/Vhenthiso'ccursthespindle sleeve being simultaneously 'rotated by theprovision of the l"threads 3, -is pus'hedfinto"Il the' pressure rod 4and pievent'sftliefbrelring of any ofthe parte "Subj ected tor'pressure-other l than the boltsl 7 and 8;" lnplaceofthe'shearing boltsl may alsqmakeff'se o'flfa tearing `bolt or of any equivalentrfrangible, separable `orreleasiligmeansgrf.- 1 1 V I -Figure-Qillustrates a'fmodified constructionvwhich is particularly'Idistinguished by thev act= that the pressure spindle i12 fi's providedfwith -a .globular stud-z 13 andis 4directly sc'rew-threadedly engagedfwitliin the presl sure rod 11. By this means the separate spindlesleeve, used in the construction according to Figure 1, may be dispensedwith. The securing of the parts is likewise effected by the shearingbolts 14 and 15.

Another modified construction is shown in Figures 3 and 4 of thedrawing. Two rings 15 and 16 to be inserted into the pressure rod of themachine are superimposed and are in Contact with each other alonghelical lines or surfaces 17. and 18 and in such a manner that upon theturning of the two rings with relation to each other the total length ofthe machine element becomes reduced. The twisting of the rings withrelation to each other is prevented by means of a twisting bolt 19 whichis retained in the outer portions of the two rings by a square head 2Oou each side. The said bolt is weakened at its central part, and it istwistingly divided at the maximum torque or torsional strain. The crosssection of the said bolt is so arranged that a certain predeterminedAtorsional strain or torque, and consequently a predetermined axialpressure of the machinery, may be insured. This modification isparticularly adapted for rolling-mill supports, butit may, of course,also be used in connection with other machinery.

ln describing the use and construction of torsoini @essere @ed torqueabout the other mein er., and securing-means coupling said members andadapted to; releasethe. same under predeterminedistrain.

2.. In a, safety connector for driving and driven elements, 21 CouplingConnection 15etwesn saidelementsapivetally Coupled t0' 011e element andlhaving a. helical Aconnection with. the other element-,and s eculltrvmeans between .said Connetion. and the. latter.- named .eleerentoneatve@O wlease -thezsame finder. -21 predetermined straw-Y 3. VIn a safetyconnectorfor. ,the Working. rafts .O f. machinery.' deringenddriven?elements, a member. prtelly. connetd .to one ofl said elements andicoaxially arranged 'with respect tothe other element, a secondfmemhercoaxially'- mounted on. the first-named member,` said second nien'iherandthe other of said 'elements having helical 'engaginliq surfaces, 'andf securing means l connecting the secondna'med member and second-namedelement and operative to release the same from connection under apredetermined strain.

4. In a safety connector for the working parts of machinery, a pressurerod, a shaft, a sleeve surrounding said shaft intermediate the'snme andthe pressure rod and screw thrcadedly displaceable Within said pressurerod, pivoting means at the outer end of said shaft, and safety meansconnecting the sleeve and the pressure rod, and adaptedto release thesaine under a predetermined strain. Y

In a safety connector` for the working parts ofinachinery7 an axiallyrecessed presi snrc rod` a shaft, a sleeve surrounding said shaftintermediate the same and the'pressure 4rod and rotatable with relationto the shaft, said rod and sleeve liavinghelical. cn'- ,Qnging portions,and safety lmeans connecting the sleeve and pressure rod, 'andadapted torelease the .same under. a predetermined strain.

6. In a safety connector1 for the Working parts of machinery, a'pressure rod, a Arotary shaft in axial alinement with the rod; ahelicalconnection betiveen the 4rod* and shaft, and Securingmeans-holding said connection from independent. movement and adapted atobe'rel'eased under a predetermined strain.`

In testimony whereof- I affix my'signature.'

Orino GEORG.

